Powers e420 Series Combination T/P Tempering Valves User Manual

Page 3

Preventative Maintenance

Servicing

To Disassemble:
1. Turn off hot & cold water supply-stops
2. Remove the handle and trim plate
3. Remove 4 bonnet screws and bonnet assembly
4. Remove all internal components from valve body
5. At this point you should have an empty valve body.

WARNING: After completing any maintenance/repairs, reset the high

temperature limit stop.

To Reassemble:
1. Ensure the inside of the valve body is free of deposits and debris.

Clean as necessary.

2. Push the cartridge into the body without the “O” rings installed. The

cartridge should slide in easily, and bottom out with its large fins just

inside the front surface of the casting. If the cartridge is difficult to

install, or does not go in all the way, remove the cartridge and clean

the body or remove any obstructions. Repeat this step until the car-

tridge installs easily.

3. Remove the cartridge and install the 2 “O” rings. Lubricate the “O”

rings with silicon lubricant.

4. Install the cartridge back into the body. The cartridge should go in

until the large fins are just inside the front surface of the casting

(same position as in step 2).If you cannot push it in all the way due to

O-rings, use bonnet and two (2) screws to force in.

5. Place the wax element into the stem assembly, stem

side first, and place this bonnet-stem-motor assembly

into/onto the valve body. Rotate the bonnet assembly to line up the

bonnet screw holes and reinstall and tighten

the four bonnet screws.

6. With handle, rotate the stem assembly clockwise, until

it bottoms out on the cartridge. At this point your valve is in the off

position.

7. Turn the hot and cold water supplies back on and verify

there is no leakage.

8. Verify proper operation by rotating the stem from the

off position, counterclockwise, to the high temperature position.

Verify the temperature does not exceed your desired maximum tem-

perature. Rotate stem back to the

off position.

9. Leave the adjusting stem in the full hot position

to determine the high temperature limit stop is set

properly. If not, rotate clockwise or counterclockwise, decrease or

increase the high temperature limit stop respectively. Powers rec-

ommends a maximum setting

of 110°F (43°C).

10. Install handle with the screw provided onto the stem and tighten in

place. Ensure that the set screw lines up with the groove on the

adjustment stem.

NOTE: Before servicing checkstops or piping, always turn off the

upstream water supply.

EVERY 12 MONTHS:
Open up the checkstops and check for free movement of the poppet.

To access the checkstops, remove the valve handle assembly and dial

plate.
Before servicing, turn off the water supply upstream.

To close the checkstops, turn the adjustment screw fully clockwise on

each checkstop.
Remove the valve bonnet and rinse all grit and impurities from the

internal components.
Winterize valves that are used outdoors. Remove and store the internal

components and drain all water from the valve.

EVERY 3 MONTHS:
Every three months, check the maximum temperature

setting (handle rotation setting).

Always verify the maximum temperature setting of the valve

when any changes ar ance/safety program.

WARNING

Safety Guidelines - All Models

Adherence to these guidelines and recommendations promotes safe

product use and ensures proper valve performance.
1. Thermostatic water mixing valves are control devices which must be

cleaned and maintained on a regular basis. Powers specifies period-

ic maintenance at least once a year or immediately after any chang-

es are made to the plumbing system. Annual cleaning and inspection

is recommended, however, frequency of cleaning depends on quality

of local water conditions. Refer to the Preventive Maintenance sec-

tion for recommended cleaning procedure.

2. WARNING: To prevent injury to the user, it is important to periodi-

cally check the maximum temperature adjustment on the valve.

3. Quick closing valves may cause damage to the mixing valve by cre-

ating shock waves. When the HydroGuard

supplies tempered water

to self-closing and/or solenoid valves, Powers recommends install-

ing a shock absorber (Powers Part #460-353) on the discharge line,

which will protect the HydroGuard

from damage.

4. Position the e420 valve as close as possible to outlet fixture to avoid

waste of energy and water (except in applications where the valve is

used as a primary mixing valve).